i = 0#代表行数
while i < 5:
    j = 0#代表个数
    while j < 5:
        print('*',end='')
        j += 1
    print()
    i += 1

x = 0
while x < 5:
    print('*' * x)
    x += 1

n = 0
while n < 5:
    m = 0
    while m <= n:
        print('*',end='')
        m += 1
    print()
    n += 1
#99乘法表
a = 1
while a <=9:
    b = 1
    while b <= a:
        print(f'{a}*{b}={a*b}',end='\t')
        b += 1
    print()
    a += 1